Winding



Apfil 1 1924. 8 1,488,873

C. W. FRANCIS WINDING Original Filed Feb. 5, 1920 v A (f 4 .g 4/1 R45; 4% INVENTOR' -(Q W ATTORNEY! Patented Apr. 1, 1924.

UNITED STATES PATENT OFFICE.

CHARLES W. FRANCIS, OF PATERSON, NEW JERSEY, ASSIGNOR TO GILLESPIE EDEN CORPORATION, OF PATERSON, NEW JERSEY, A CORPORATION OF DELAWARE.

WINDING.

Original application filed February 3, 1920, Serial No. 356,027.

Divided and this application filed.

November 19, 1920. Serial No. 425,051.

To all whom it may concern:

Be it known that 1, CHARLES TV. FRANCES,

a citizen of the United States, residing at Paterson, in the county of Passaic and State of New Jersey, have invented certain new and useful Improvements in Windings, of which the following is a specification.

My invention relates to a winding which is particularly adapted for the field coils of multi-polar electric machines, it being understood that the winding may be made in a large variety of shapes and for different purposes.

One of the objects of my invention is to provide a winding in which there shall be a number of fiat, separate coils of increasing sizes and arranged with sufiicient space be tween the sides of the coils so that the same may be slipped around the poles of a multipolar field piece, which winding shall be of one continuous piece of wire so that the winding can be made cheaply and at the same time have it insulation uniform throughout the completed winding.

Another object of my invention is to so shape the several coils of the winding that there shall be no difliculty in getting them into their slots.

Another object of my invention is to provide a shape for the end portions of the coils which shall reduce the amount of inactive wire.

With these and other objects in view, my invention consists in the article hereinafter fully described and particularly pointed out in the appended claim.

This application is a division of my application Serial No. 356,027 filed February 3rd, 1920, entitled Apparatus for making windings.

In the drawing, the figure illustrates, more or less diagrammatically, one form of winding embodying my invention. In the drawing only two layers of wire have been shown in each coil, but it will be understood that as many as desired may be provided, and particularly that the number of turns in each plane, which will determine the width of the winding, may be of any desired number. Beginning at the terminal 10, the wire, which is continuous throughout the winding, passes into the inner coil 11 around which, in the diagrammatic View, it passes twice completely, the end 12 then passing to the wire.

next coil 13 around which it again passes twice completely, with its end 14 passing to the outer coil 15, the end of which, 16, is preferably bent upwardly parallel or around the. terminal 10. It will be understood that any desired number of coils may be formed in the winding.

It will be observed that in the form shown in the drawing, the top and bottom of the respective coils are adjacent each other, whereas the sides are widely separated from the sides of adjacent coils.

In order to provide an easy method by which the winding may be kept in shape and position until the winding is placed in the machine in which it is to be used, I preferably provide a temporary binding wire such as 17, 18, at the top and bottom of the winding, this temporary binding wire being fastened so as to hold the coils together until they are in position of use.

In order that the shape and location of the corners of the several coils be better seen, I have shown at each corner a circle whose center is the center of curvature of the wire forming the corner. It will be observed that the wire does not make a right-angle turn but is bent around an arc of small radius to make the corner. This has the advantage that there is no sharp edge to the former on which the coil is made and so no damage to the insulation at the corners.

It will be further observed that the dotted circles are in two rows which are not quite straight but are convex away from each other. This illustrates an important feature of my invention, namely, that the inner coils are slightly longer than the outer ones. The advantage thus secured is that the coils which are more dificult to get over the teeth into the slots have slightly more play lengthwise to make their insertion easier.

The shape of the end portions of the coils is not a straight line but the wire leaves the dotted circle at a tangent that makes an angle with the general direction of the end portion and is curved into an arched shape that reaches to the other dotted circle. There is a small saving of length in each turn accomplished by this shape which when all the turns together are considered amounts to a substantial saving in length of inactive The internal resistance of the machine is thus reduced or for the same in ternal resistance smaller wire may be used and so a larger number of turns secured.

It, of course, is not new to form a Winding of a number of coils, but the particular adiantage of my invention consists of forming such a Winding from a continuous piece of wire so that the insulation on the Wiic is continuous throughout the winding. Furthermore, in the i lining o1 such winding, the delay occasioned by fastening the ends of successive coils together is avoided.

It will be understood that the ninnlmr of coils may be varied, together with lllQll shape and size, Within Wide limits.

I claiinz A. wiiuling' including a number oi. approxinmtely rectangular concentrii'z coils, the inactive portions of each coil being come); outward and the lengths of the rectangles for the inner coils bcn i of the rectangles for tile siu'rounl'lingr coils.

CHARLES W FRAYCIS.

"' gicaiter than those 20 

